package com.example.listviewtest;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

public class FruitAdapter extends ArrayAdapter<Fruit> {

    private int resourceId;

    public FruitAdapter(Context context, int textViewResourceId, List<Fruit> objects){
        super(context,textViewResourceId,objects);
        resourceId = textViewResourceId;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        Fruit fruit = getItem(position);    // 获取当前项的 Fruit 实例
        View view = LayoutInflater.from(getContext()).inflate(resourceId,parent,false);
        ImageView fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
        TextView fruitName = (TextView) view.findViewById(R.id.fruit_name);
        fruitImage.setImageResource(fruit.getImageId());
        fruitName.setText(fruit.getName());
        return view;
    }

    @Override
    public View getView(int position,View convertView,ViewGroup parent){
        Fruit fruit = getItem(position);
        View view;
        RecyclerView.ViewHolder viewHolder;
        if(convertView == null){
            view = LayoutInflater.from(getContext()).inflate(resourceId,parent,false);
            viewHolder = new RecyclerView.ViewHolder();
            viewHolder.fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
            viewHolder.fruitName = (TextView) view.findViewById(R.id.fruit_name);
            view.setTag(viewHolder);    // 将 ViewHolder 存储在 view 中
        } else{
            view = convertView;
            viewHolder = (RecyclerView.ViewHolder) view.getTag();   // 重新获取 ViewHolder
        }
//        ImageView fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
//        TextView fruitName = (TextView) view.findViewById(R.id.fruit_name);
//        fruitImage.setImageResource(fruit.getImageId());
//        fruitName.setText(fruit.getName());
        viewHolder.fruitImage.setImageResource(fruit.getImageId());
        viewHolder.fruitName.setText(fruit.getName());
        return view;
    }

    class ViewHolder{
        ImageView fruitImage;
        TextView fruitName;
    }
}

